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Top panel: Mean RT (ms) for congruent and incongruent trials as a function of proportion congruency. Center and bottom panels: The black line in the scatterplots illustrates the relationship between age and the item-specific proportion congruency (ISPC) effect as reflected in RTs (center) and z-scores (bottom). The red line shows the LOESS smoothed age trajectory; the dashed line indicates the age at which changes started (color figure online).
